Hand-held pneumatic tools, using compressed air to push the piston reciprocating movement, so that the pick constantly hit.Used for mining, road building, etc. Pneumatic pick is composed of air distribution mechanism, impact mechanism and pick drill.The impact mechanism is a thick - wall cylinder, in which an impact hammer can be reciprocated along the cylinder inner wall.The end of the pickaxe is inserted into the front of the cylinder, and the rear end of the cylinder is equipped with an air distribution valve box.